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Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Homo sapiens

PROVIDER: GSE125376 | GEO | 2021/01/17

REPOSITORIES: GEO

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Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia [ChIP-seq]

Project description:In this study we identified the histone demethylase KDM4A as an essential and selective regulator of AML oncogenic potential. ChIPseq was used to identify KDM4A bound genes and follow changes in H3K9me2/3 and H3K27me3 following KDM4A knockdown in MLL-AF9 human AML THP-1 cells

2021-01-17 | GSE125375 | GEO

Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia [RNA-seq]

Project description:In this study we identified the histone demethylase KDM4A as an essential and selective regulator of AML oncogenic potential. RNAseq was used to follow the changes in gene expression following KDM4A knockdown in MLL-AF9 human AML THP-1 cells

2021-01-17 | GSE125374 | GEO

Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia

Project description:Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia

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Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia [RNA-seq]

Project description:Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia [RNA-seq]

| PRJNA515967 | ENA

Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia [ChIP-seq]

Project description:Histone demethylase KDM4A-mediated promotion of PAF1/NFATC2 expression is required for oncogenesis in MLL-AF9 acute myeloid leukemia [ChIP-seq]

| PRJNA515968 | ENA

MLL-AF9 initiates transformation from fast-proliferating myeloid progenitors.

Project description:Cancer is a hyper-proliferative disease. Whether the proliferative state originates from the cell-of-origin or emerges later remains difficult to resolve. By tracking de novo transformation from normal hematopoietic progenitors expressing an acute myeloid leukemia (AML) oncogene MLL-AF9, we reveal that the cell cycle rate heterogeneity among granulocyte-macrophage progenitors (GMPs) determines their probability of transformation. A fast cell cycle intrinsic to these progenitors provide permissiveness for transformation, with the fastest cycling 3% GMPs acquiring malignancy with near certainty. Molecularly, we propose that MLL-AF9 preserves gene expression of the cellular states in which it is expressed. As such, when expressed in the naturally-existing, rapidly-cycling immature myeloid progenitors, this cell state becomes perpetuated, yielding malignancy. In humans, high CCND1 expression predicts worse prognosis for MLL fusion AMLs. Our work elucidates one of the earliest steps toward malignancy and suggests that modifying the cycling state of the cell-of-origin could be a preventative approach against malignancy.

| S-EPMC6920141 | biostudies-literature

Polycomb repressive complex 2 is required for MLL-AF9 leukemia.

Project description:A growing body of data suggests the importance of epigenetic mechanisms in cancer. Polycomb repressive complex 2 (PRC2) has been implicated in self-renewal and cancer progression, and its components are overexpressed in many cancers. However, its role in cancer development and progression remains unclear. We used conditional alleles for the PRC2 components enhancer of zeste 2 (Ezh2) and embryonic ectoderm development (Eed) to characterize the role of PRC2 function in leukemia development and progression. Compared with wild-type leukemia, Ezh2-null MLL-AF9-mediated acute myeloid leukemia (AML) failed to accelerate upon secondary transplantation. However, Ezh2-null leukemias maintained self-renewal up to the third round of transplantation, indicating that Ezh2 is not strictly required for MLL-AF9 AML, but plays a role in leukemia progression. Genome-wide analyses of PRC2-mediated trimethylation of histone 3 demonstrated locus-specific persistence of H3K27me3 despite inactivation of Ezh2, suggesting partial compensation by Ezh1. In contrast, inactivation of the essential PRC2 gene, Eed, led to complete ablation of PRC2 function, which was incompatible with leukemia growth. Gene expression array analyses indicated more profound gene expression changes in Eed-null compared with Ezh2-null leukemic cells, including down-regulation of Myc target genes and up-regulation of PRC2 targets. Manipulating PRC2 function may be of therapeutic benefit in AML.

| S-EPMC3324004 | biostudies-literature

SUV39H1 regulates the progression of MLL-AF9-induced acute myeloid leukemia.

Project description:Epigenetic regulations play crucial roles in leukemogenesis and leukemia progression. SUV39H1 is the dominant H3K9 methyltransferase in the hematopoietic system, and its expression declines with aging. However, the role of SUV39H1 via its-mediated repressive modification H3K9me3 in leukemogenesis/leukemia progression remains to be explored. We found that SUV39H1 was down-regulated in a variety of leukemias, including MLL-r AML, as compared with normal individuals. Decreased levels of Suv39h1 expression and genomic H3K9me3 occupancy were observed in LSCs from MLL-r-induced AML mouse models in comparison with that of hematopoietic stem/progenitor cells. Suv39h1 overexpression increased leukemia latency and decreased the frequency of LSCs in MLL-r AML mouse models, while Suv39h1 knockdown accelerated disease progression with increased number of LSCs. Increased Suv39h1 expression led to the inactivation of Hoxb13 and Six1, as well as reversion of Hoxa9/Meis1 downstream target genes, which in turn decelerated leukemia progression. Interestingly, Hoxb13 expression is up-regulated in MLL-AF9-induced AML cells, while knockdown of Hoxb13 in MLL-AF9 leukemic cells significantly prolonged the survival of leukemic mice with reduced LSC frequencies. Our data revealed that SUV39H1 functions as a tumor suppressor in MLL-AF9-induced AML progression. These findings provide the direct link of SUV39H1 to AML development and progression.

| S-EPMC7728597 | biostudies-literature

DOT1L, the H3K79 methyltransferase, is required for MLL-AF9-mediated leukemogenesis.

Project description:Chromosomal translocations of the mixed lineage leukemia (MLL) gene are a common cause of acute leukemias. The oncogenic function of MLL fusion proteins is, in part, mediated through aberrant activation of Hoxa genes and Meis1, among others. Here we demonstrate using a tamoxifen-inducible Cre-mediated loss of function mouse model that DOT1L, an H3K79 methyltransferase, is required for both initiation and maintenance of MLL-AF9-induced leukemogenesis in vitro and in vivo. Through gene expression and chromatin immunoprecipitation analysis we demonstrate that mistargeting of DOT1L, subsequent H3K79 methylation, and up-regulation of Hoxa and Meis1 genes underlie the molecular mechanism of how DOT1L contributes to MLL-AF9-mediated leukemogenesis. Our study not only provides the first in vivo evidence for the function of DOT1L in leukemia, but also reveals the molecular mechanism for DOT1L in MLL-AF9 mediated leukemia. Thus, DOT1L may serve as a potential therapeutic target for the treatment of leukemia caused by MLL translocations.

| S-EPMC3128482 | biostudies-literature

TIFAB accelerates MLL-AF9-Induced acute myeloid leukemia through upregulation of HOXA9.

Project description:We previously showed stabilization of NIK-induced activation of NF-κB non-canonical signaling suppresses MLL-AF9-induced AML. In the current study, we demonstrate that deletion of NF-κB non-canonical RelB prevents the inhibitory effect of NIK stabilization in MLL-AF9 AML. Mechanistically, RelB suppresses its direct target, TIFAB, which is upregulated in human AML and correlates negatively with the survival of AML patients. Forced expression of TIFAB reverses NIK-induced impaired AML development through downregulation of RelB and upregulation of HOXA9. Consistent with upregulation of HOXA9, gene set enrichment analysis shows that forced expression of TIFAB blocks myeloid cell development, upregulates leukemia stem cell signature and induces similar gene expression patterns to those of HOXA9-MEIS1 and HOXA9-NUP98, and upregulates oxidative phosphorylation. Accordingly, forced expression of HOXA9 also largely releases the inhibitory impact of NIK stabilization via downregulation of RelB and upregulation of RelA. Our data suggest that NIK/RelB suppresses MLL-AF9-induced AML mainly through downregulation of TIFAB/HOXA9.

| S-EPMC8633042 | biostudies-literature

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